CN115889579A

CN115889579A - Manufacturing method of wheel spoke made of pickup steel

Info

Publication number: CN115889579A
Application number: CN202211407238.7A
Authority: CN
Inventors: 段大为; 聂志南; 李素雄; 沈泽武
Original assignee: Dongfeng Automotive Wheel Suizhou Co ltd
Current assignee: Dongfeng Automotive Wheel Suizhou Co ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-04-04

Abstract

The invention relates to a manufacturing method of a wheel spoke made of pickup steel, which comprises the following molding procedures: the method comprises the following steps of utilizing a forming device to perform compression forming on a spoke initial sample to obtain a spoke body, wherein a convex part protruding towards the outer side of a spoke is formed on the spoke body; trimming: punching a central process hole in the center when the periphery of the spoke body is trimmed, wherein the central process hole is coaxial with the spoke body; and (3) flanging: pre-turning a boss of the central process hole, wherein the boss and the protruding part are arranged in the same direction; a punching procedure: and punching a center hole and a bolt hole on the flanged spoke body by using a punching die to obtain the spoke. The manufacturing method of the pick-up steel wheel spoke provided by the invention not only can ensure the alignment and positioning stability of the spoke, but also can ensure the concentricity and the radial jump of the bolt hole and the central hole on the basis of not increasing the working procedures, reduce the average value of the radial jump of the spoke, improve the qualified rate of one-time off-line synthesis, and further improve the manufacturing efficiency of the pick-up steel wheel spoke.

Description

Manufacturing method of wheel spoke made of pickup steel

Technical Field

The invention relates to the field of automobile wheel manufacturing, in particular to a manufacturing method of a wheel spoke made of pickup steel.

Background

The wheel is formed by welding a rim and a spoke, wherein a tire is installed on the rim in an inflation fit mode, and the spoke is installed on a front axle and a rear axle of a vehicle, wherein the spoke is an important part carried by the vehicle and bears vertical load, transverse force, driving torque and various stresses generated in the running process of the vehicle. Therefore, there are high demands on the design and manufacture of the wheel spoke, and the manufacturing process thereof is one of the key factors for ensuring the performance of the wheel spoke.

The pick-up truck has wide use scenes, poor use conditions and large corresponding bearing capacity, and the front shaft and the rear shaft which bear the weight of the whole truck are large relative to the axles of the passenger cars, so the manufacturing requirements of the spokes are relatively stricter, and the punching process of the prior pick-up truck after the spokes are trimmed mainly has the following two modes: one is to punch the outside together in the trimming process, the process is simple, the process is few, its disadvantage is in the subsequent process, the size of centre bore is out of shape greatly, the radial jump of the spoke is bad; and the other method is that after the process hole is finished, the central hole is punched independently, so that the size of the central hole is guaranteed, but the size deviation is caused by the order change, and the spoke diameter jump value is larger. The two process methods have the defect of large diameter jump value of the spoke, the diameter jump value is further increased after the rim and the spoke are welded and synthesized, the one-time qualified rate of synthesis is reduced, meanwhile, the comfort of the whole vehicle is influenced due to the large diameter jump value of the wheel, and the product is lack of competitiveness.

Disclosure of Invention

Based on the above description, the invention provides a manufacturing method of a pick-up steel wheel spoke, which aims to solve the problem that the diameter jump value of the steel wheel spoke is large in the prior art.

The technical scheme for solving the technical problems is as follows:

a manufacturing method of a wheel spoke made of Picard steel comprises the following steps:

a molding procedure: the method comprises the following steps of performing compression molding on a spoke initial sample by using a molding device to obtain a spoke body, wherein a convex part protruding towards the outer side of a spoke is formed on the spoke body;

trimming: punching a central process hole in the center when the periphery of the spoke body is trimmed, wherein the central process hole is coaxial with the spoke body;

and (3) flanging: pre-turning a boss for the central process hole, wherein the boss and the boss are arranged in the same direction;

a punching procedure: and punching a center hole and a bolt hole on the flanged spoke body by using a punching die to obtain the spoke.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, before the molding process, the method further comprises:

a stretching process: and stretching the spoke blank for the first time, and stretching for the second time according to the shape requirement of the spoke after stretching for the first time to obtain the stretched spoke initial sample.

Further, before the stretching process, the method further comprises:

blanking procedure: and blanking by using a blanking machine to obtain the spoke blank.

Further, the molding apparatus includes: the device comprises a base, a positioning piece and a forming body;

the upper surface of the base and the lower surface of the molding body are respectively provided with the shapes which are approximately the same as the outer surface and the inner surface of the spoke initial shape so as to construct and form an accommodating space matched with the spoke initial shape; the positioning piece is arranged on the base and used for positioning the forming body.

Further, the punching die comprises an upper die mechanism and a lower die mechanism;

the upper die mechanism and the lower die mechanism are arranged oppositely, the flanged spoke body is placed on the lower die mechanism before a punching process is carried out, and the upper die mechanism is utilized to apply pressure to the flanged spoke body so as to obtain the central hole and the bolt hole.

Further, the upper die mechanism includes: the device comprises a bolt hole male die, a center hole male die, a stripper plate, a male die fixing plate and an upper die base;

the punch fixing plate is arranged on one side, facing the lower die mechanism, of the upper die base, the bolt hole male die and the central hole male die are arranged on one side, facing away from the upper die base, of the punch fixing plate, the central axis of the central hole male die is located at the central axis of the punching die, an avoiding groove is formed in one side, away from the punch fixing plate, of the central hole male die, and the avoiding groove is used for avoiding the boss;

the stripper plate is connected to one side, facing the lower die mechanism, of the upper die base and located on the periphery of the male die fixing plate, and the outer contour of the stripper plate is matched with the shape of the protruding portion of the spoke body.

Further, the upper die mechanism further comprises a guide pin;

the guide pin is connected to one side, away from the punch fixing plate, of the central hole punch, and the guide pin and the central hole punch are coaxially arranged; and in the punching process, the outer diameter of the pilot pin is not less than the inner diameter of the boss so as to position and pilot the spoke.

Further, the lower die mechanism includes: the die comprises a bolt hole female die, a central hole female die, a female die fixing plate and a lower die holder;

the female die fixing plate is arranged on one side, facing the upper die mechanism, of the lower die holder, the bolt hole female die and the central hole female die are arranged on one side, facing away from the lower die holder, of the female die fixing plate, the bolt hole female die is provided with a first cavity matched with the bolt hole male die, and the central hole female die is provided with a second cavity matched with the central hole male die.

Furthermore, the punching die further comprises a control device, the control device is electrically connected with the upper die mechanism, and the control device is used for controlling the upper die mechanism to move towards or away from the lower die mechanism.

Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

the manufacturing method of the pickup steel wheel spoke provided by the invention comprises a forming process, an trimming process, a flanging process and a punching process, wherein a central process hole is punched at the center of the spoke body in the trimming process, the central process hole is trimmed to obtain a small central hole coaxial with the spoke body, then, in the flanging process, the small central hole is subjected to flanging operation to obtain a boss, the boss is concentric with the outer diameter of the spoke, the positioning and the guiding of the spoke are realized through the matching relationship between the boss and a punching die, and the rigidity of the central hole is enhanced by the pre-flanging central hole, and is similar to a reinforcing rib, and the central hole is not easy to deform; in the punching process, the center process hole which is turned over in advance during flanging is used for guiding, the punching center large hole and the punching bolt hole are designed to be punched together by using the punching die, the concentricity error between the center hole and the outer diameter of the spoke can be further reduced, and the concentricity and the radial run-out of the bolt hole and the center hole can be guaranteed. The manufacturing method of the pick-up steel wheel spoke provided by the invention can ensure the guiding and positioning stability effects of the spoke in the punching process by utilizing the trimming process and the flanging process, and simultaneously, the bolt hole and the central hole are punched together by utilizing the punching process, so that the concentricity and radial jump of the bolt hole and the central hole are further ensured, the average value of radial jump of the spoke is reduced on the basis of not increasing the processes, the one-time off-line qualification rate of synthesis is improved, and the manufacturing efficiency of the pick-up steel wheel spoke is further improved.

Drawings

FIG. 1 is a schematic view of a composite assembly for a wheel provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view of a method of manufacturing a Picard steel wheel spoke according to an embodiment of the invention;

FIG. 3 is a schematic process diagram of a manufacturing method of a Picard steel wheel spoke according to an embodiment of the invention;

FIG. 4 is a schematic structural view of a punching die according to an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

in the drawings, the reference numbers indicate the following list of parts:

1. a spoke; 11. a spoke body; 111. a boss; 12. a central bore; 13. bolt holes;

2. a rim;

3. punching a die; 31. an upper die mechanism; 311. a bolt hole male die; 312. a central hole male die; 3121. an avoidance groove; 313. a male die fixing plate; 314. an upper die holder; 315. a material returning plate; 316. a pilot pin; 32. a lower die mechanism; 321. a central hole female die; 322. a bolt hole female die; 323. fixing a female die plate; 324. and a lower die holder.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention.

Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The embodiments of the present invention will be described in further detail with reference to the drawings and examples, which are provided for illustrating the present invention but are not intended to limit the scope of the present invention.

As shown in fig. 1 to 5, an embodiment of the present invention provides a method for manufacturing a kayak-steel wheel spoke 1, including:

step S1, a forming procedure: the spoke blank is press-molded by a molding device to obtain a spoke body 11, wherein a convex portion protruding outward of the spoke 1 is formed on the spoke body 11.

Step S2, trimming: and punching a central process hole in the central position when trimming the periphery of the spoke body 11, and trimming the central process hole, wherein the central process hole is coaxial with the spoke body 11.

Step S3, flanging process: for the center fabrication hole pre-turning boss 111, the boss 111 is arranged in the same direction as the boss.

Step S4, a punching process: and punching a center hole 12 and a bolt hole 13 on the flanged spoke body 11 by using the punching die 3 to obtain the spoke 1.

Specifically, as shown in fig. 1, the composite assembly of the wheel is formed by welding a rim 2 and a spoke 1, the outer diameter of the spoke 1 is welded after being in interference fit with the groove bottom of the rim 2, and the concentricity of the spoke center hole 12 and the outer diameter of the spoke 1 directly influences the radial run-out of the fit composite of the two.

As shown in fig. 2, the spoke 1 is firstly pressed and molded by a molding device to obtain a spoke body 11, then a central process hole is punched in the trimming of the spoke 1, and a pre-turning boss 111 is further designed in a flanging process to form a small central hole, so that the concentricity of the small central hole and the straight end of the spoke 1 is ensured.

The pre-turned boss 111 not only enhances the rigidity of the central hole 12, is similar to a reinforcing rib, the small central hole is not easy to deform, but also plays an effective and reliable guiding role in the subsequent working procedure, and the concentricity is ensured by utilizing the co-forming of the pre-turned central hole boss and the outer diameter of the spoke 1.

Finally, in the punching process, the bolt hole 13 and the central hole 12 can be punched and cut together by using the punching die 3, the central hole 12 and the bolt hole 13 are punched and guided by using a pre-turned small central hole during punching, the position error of the bolt hole 13 relative to the central hole 12 is less than 0.1mm, the diameter jump value of the spoke 1 can be reduced by more than 0.4mm, the off-line qualification rate of one-time synthesis is more than 99%, the synthesis rework amount is reduced, and the product performance quality is improved.

It should be noted that, in the prior art, the bolt hole 13 and the center hole 12 are not always in the same process, and the process needs to be changed, and there must be a plurality of positioning errors during the process, and the effect of correcting the outer diameter of the spoke 1 by the shape of the bolt hole punch 311 is not as good as that of the small center hole formed by the pre-turned boss 111 according to the embodiment of the present invention.

The manufacturing method of the pickup steel wheel spoke provided by the invention comprises a forming process, an trimming process, a flanging process and a punching process, wherein a central process hole is punched at the center of the spoke body 11 in the trimming process, the central process hole is trimmed to obtain a small central hole coaxial with the spoke body 11, then, in the flanging process, the flanging operation is carried out on the small central hole to obtain a boss 111, the boss 111 and the outer diameter of the spoke 1 are concentric, the positioning and the guiding of the spoke 1 are realized through the matching relation of the boss 111 and a punching die 3, and the rigidity of the central hole 12 is enhanced by the pre-flanging central hole 12, and the central hole 12 is similar to a reinforcing rib and is not easy to deform; in the punching process, the center process hole which is turned in advance during flanging is used for guiding, the punching die 3 is used for punching the center large hole and the punching bolt hole 13 together, the concentricity error of the center hole and the outer diameter of the spoke 1 can be further reduced, and the concentricity and the radial run of the bolt hole 13 and the center hole 12 can be guaranteed. The manufacturing method of the pickup steel wheel spoke 1 provided by the invention can ensure the guiding and positioning stability effects of the spoke 1 in the punching process by utilizing the trimming process and the flanging process, and simultaneously, the bolt hole 13 and the central hole 12 are punched together by utilizing the punching process, so that the concentricity and radial jump of the bolt hole 13 and the central hole 12 are further ensured, the average value of the radial jump of the spoke 1 is reduced on the basis of not increasing the processes, the one-time off-line qualification rate is improved, and the manufacturing efficiency of the pickup steel wheel spoke 1 is further improved.

In an optional embodiment, before the molding process, the method further includes:

a stretching process: and (3) carrying out primary stretching on the spoke blank, and carrying out secondary stretching according to the shape requirement of the spoke 1 after the primary stretching to obtain a stretched spoke initial sample.

Further, before the stretching process, the method further comprises:

blanking: and blanking by using a blanking machine to obtain spoke blanks.

Specifically, as shown in fig. 3, the manufacturing process of the spoke 1 sequentially comprises: blanking, stretching, reverse stretching, forming, trimming, flanging and punching bolt holes 13 and a central hole 12. The method comprises the steps of obtaining a spoke initial sample in an initial form through stretching and reverse stretching after blanking, then forming the spoke initial sample by using forming equipment to obtain a spoke body 11, obtaining a small central hole 12 boss 111 through trimming and flanging, finally placing the spoke body 11 on a punching die 3, and punching the spoke body to obtain the required spoke 1.

Wherein, the height of the pre-turned small central hole boss 111 is about 8-10mm, and the pilot effect is poor in the subsequent punching process when the boss 111 is too short; if the pre-turning boss 111 is high, the boss 111 is stuck to the outer surface and cannot fall off due to the limited space and difficult material returning force of the pilot pin 316 on the center hole 12, and the next blanking cannot be performed.

Further, the molding device includes: base, setting element and shaping body.

The upper surface of the base and the lower surface of the forming body are respectively provided with a shape which is approximately the same as the outer surface and the inner surface of the spoke initial shape so as to construct and form an accommodating space matched with the spoke initial shape; the positioning piece is arranged on the base and used for positioning the forming body. Through setting up the primary forming that forming device can effectual guarantee spoke.

In an alternative embodiment, as shown in fig. 4, the punch 3 includes an upper die mechanism 31 and a lower die mechanism 32.

The upper die mechanism 31 and the lower die mechanism 32 are arranged oppositely, before the punching process is carried out, the flanged spoke body 11 is placed on the lower die mechanism 32, and the upper die mechanism 31 is used for pressing the flanged spoke body 11 to obtain the central hole 12 and the bolt hole 13.

Wherein, last mold mechanism 31 includes: a bolt hole male die 311, a center hole male die 312, a stripper plate 315, a male die holder 313 and an upper die base 314.

Specifically, the punch retainer 313 is disposed on a side of the upper die holder 314 facing the lower die mechanism 32, and both the bolt hole punch 311 and the central hole punch 312 are disposed on a side of the punch retainer 313 facing away from the upper die holder 314, wherein a central axis of the central hole punch 312 is located at a central axis of the punching die 3, and, as shown in fig. 5, an avoiding groove 3121 is disposed on a side of the central hole punch 312 away from the punch retainer 313, and the avoiding groove 3121 is used for avoiding the boss 111.

The stripper plate 315 is connected to a side of the upper die base 314 facing the lower die mechanism 32 and is located at the periphery of the punch retainer 313, and the outer contour of the stripper plate 315 is matched with the shape of the convex portion of the spoke body 11.

Specifically, in the process of punching the bolt holes 13 and the central hole 12, in order to reduce the deformation amount of the spoke 1, the stripper plate 315 with a shape matched with the shape of the spoke 1 is manufactured according to the shape of the spoke 1 so as to avoid the influence of the radial jump caused by the deformation of the shape of the spoke 1, and the stripper plate 315 is made of a rigid material.

The upper die mechanism 31 further comprises a pilot pin 316, the pilot pin 316 is connected to one side of the central-hole male die 312, which is far away from the male die fixing plate 313, and the pilot pin 316 and the central-hole male die 312 are coaxially arranged; in the punching process, the outer diameter of the pilot pin 316 is not smaller than the inner diameter of the boss 111 to position and pilot the spoke 1.

Wherein, the outer diameter of the pilot pin 316 can not pursue the direction excessively, otherwise the lug boss 111 waste material can not be returned, the outer diameter of the pilot pin 316 is slightly larger than the inner diameter of the lug boss 111 by 0.02-0.03mm preferably.

The lower die mechanism 32 includes: a bolt hole die 322, a central hole die 321, a die fixing plate 323 and a lower die holder 324.

The female die fixing plate 323 is arranged on one side, facing the upper die mechanism 31, of the lower die holder 324, the bolt hole female die 322 and the central hole female die 321 are both arranged on one side, facing away from the lower die holder 324, of the female die fixing plate 323, wherein the bolt hole female die 322 is provided with a first cavity matched with the bolt hole male die 311, and the central hole female die 321 is provided with a second cavity matched with the central hole male die 312.

It should be noted that, because the small central hole is pre-turned in the flanging process, the central hole male die 312 for punching the central hole 12 is slightly higher than the male die during normal punching by a pre-turned central boss 111 height, that is, an avoidance groove 3121 capable of avoiding the boss 111 is provided in the center of the central hole male die 312, so that the punched waste material of the pre-turned small central hole boss 111 is lower than the plane of the central hole female die 321, in the radial direction, a gap is left between the boss 111 and the inner wall surface of the avoidance groove 3121, the depth of the avoidance groove 3121 is higher than the height of the boss 111, and the boss 111 is completely avoided, thereby preventing the central hole male die 312 from contacting the pre-turned boss 111, resulting in poor guidance of the deformation of the central hole 12, and simultaneously preventing the waste material of the boss 111 from being blocked during punching, so that the waste material of the boss 111 can smoothly drop, and ensuring the positioning of the next workpiece.

In an alternative embodiment, the punching die 3 further includes a control device electrically connected to the upper die mechanism 31, and the control device is configured to control the upper die mechanism 31 to move toward or away from the lower die mechanism 32.

Specifically, the operation process of the punching die 3 provided by the embodiment of the present invention is as follows: after the spoke 1 is positioned on the female die, the boss 111 and the pilot pin 316 which are positioned at the center modify the spoke 1 so that the central hole 12 is positioned at the center; under the action of the control device, the upper die mechanism 31 descends, the lower surface of the stripper plate 315 abuts against the upper surface of the spoke 1, and the bolt hole male die 311 and the central hole male die 312 punch the spoke 1 successively; after blanking, the upper die mechanism 31 moves upwards to release the spoke 1, and one-time stamping is completed.

According to the manufacturing method of the pick-up steel wheel spoke 1 provided by the embodiment of the invention, on one hand, the working procedures are not increased, the average diameter jump value of the spoke 1 is reduced, the one-time off-line qualification rate of synthesis is improved, a central process hole is punched in the trimming working procedure, the small central hole 12 is turned over in advance during flanging, the pre-turned central hole 12 and the outer diameter of the spoke 1 are molded together, the concentricity is guaranteed, the pre-turned central hole 12 is used for guiding during punching the bolt hole 13, the punching of a large hole and the bolt hole 13 is completed, the diameter jump value of the spoke 1 can be reduced by more than 0.4mm, the one-time off-line qualification rate of synthesis is more than 99%, the synthesis repair amount is reduced, and the product performance quality is improved; on the other hand, the bolt hole 13 and the central hole 12 are punched together, the position error of the bolt hole 13 relative to the central hole 12 is smaller than 0.1mm, and the manufacturing efficiency of the pickup spoke 1 is effectively improved.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A manufacturing method of a wheel spoke made of kayak steel is characterized by comprising the following steps:

a molding procedure: the method comprises the following steps of utilizing a forming device to carry out compression forming on a spoke initial sample to obtain a spoke body, wherein a convex part protruding towards the outer side of a spoke is formed on the spoke body;

and (3) flanging: pre-turning a boss of the central process hole, wherein the boss and the protruding part are arranged in the same direction;

2. The method of manufacturing a pick-up steel wheel spoke according to claim 1, further comprising, prior to the molding step:

3. The method of manufacturing a pick-up steel wheel spoke according to claim 2, further comprising, prior to the drawing step:

4. The method of manufacturing a pick-up steel wheel spoke according to claim 1, wherein the forming device comprises: the device comprises a base, a positioning piece and a forming body;

the upper surface of the base and the lower surface of the molding body are respectively provided with a shape which is approximately the same as the outer surface and the inner surface of the spoke prototype so as to construct and form an accommodating space matched with the spoke prototype; the positioning piece is arranged on the base and used for positioning the forming body.

5. The method of manufacturing a pick-up steel wheel spoke according to claim 1, wherein the punching die includes an upper die mechanism and a lower die mechanism;

6. The method of manufacturing a pick-up steel wheel spoke according to claim 5, wherein the upper die mechanism comprises: the device comprises a bolt hole male die, a center hole male die, a stripper plate, a male die fixing plate and an upper die base;

the punch fixing plate is arranged on one side, facing the lower die mechanism, of the upper die base, the bolt hole male die and the central hole male die are both arranged on one side, facing away from the upper die base, of the punch fixing plate, the central axis of the central hole male die is located at the central axis of the punching die, an avoiding groove is formed in one side, away from the punch fixing plate, of the central hole male die, and the avoiding groove is used for avoiding the boss;

7. The method of manufacturing a pick-up steel wheel spoke according to claim 6, wherein the upper die mechanism further comprises a pilot pin;

8. The method of manufacturing a pick-up steel wheel spoke according to claim 6, wherein the lower die mechanism comprises: the die comprises a bolt hole female die, a central hole female die, a female die fixing plate and a lower die holder;

9. The method of manufacturing a pick-up steel wheel spoke according to claim 5, wherein the punching die further comprises a control device electrically connected to the upper die mechanism, the control device being configured to control the upper die mechanism to move toward or away from the lower die mechanism.